Picture from Nothing: Silence Paints Ghosts ⚡ экспресс
Ghost imaging typically relies on the correlation of two beams: a signal beam lacking spatial resolution, and a reference beam that never interacts with the object but carries the resolution. The work demonstrates an even stranger experiment: the image is reconstructed without a single photon hitting the object. All events where light interacted with the object are discarded; only time intervals with zero photon counts in both channels are used. This method is called 'ghost imaging with zero photons.' Its realization became possible thanks to projective photon-number measurements and thermal light statistics. The results shed light on a long-standing debate about the physical nature of ghost imaging and the interplay between quantum and classical correlations.
A drummer stays silent, but from the pauses you can tell where he didn’t hit. Similarly, physicists built an image by catching not light, but moments of absolute darkness. The picture emerged from silence.
The trick lies in the mysterious statistics of thermal light, which Roy Glauber studied in the 1960s. Bright spots on the object less often fall into complete darkness. By analyzing the frequency of "zero" events, they reconstruct the silhouette. Thus silence becomes more eloquent than noise, and the boundary between quantum and classical physics vanishes.
🎯 The term 'ghost imaging' arose because the picture seems to float separately from the illuminating beam — just like a ghost.